Digital-micromirror patterned BECs

This new machine is built around a small glass vacuum cell that allows high-resolution patterning of confining potentials and imaging of resulting atom configurations, while producing large atom number condensates (4x106). We trap atoms in a combination of optical and magnetic fields, with optical confinement given by a 1920X1200 digital micromirror device (DMD). The achieved high resolution of the microscope objectives allows us to pattern the density of our BECs with high precision. 

DMD Collage

The DMD is imaged to the atoms where it is crossed with a vertically confining sheet:

Imaging system

We are exploring several areas of research on this apparatus:

  • Superfluid transport
  • Configurable optical lattices
  • Anharmonic potentials
  • Active particle transport, atom pumps

We are currently focusing on 87Rb BECs,  but are also able to utitilise a second bosonic atomic species, 41K. 

ARC Discovery Projects: Spin vortex dynamics in a ferromagnetic superfluid (2020-2023)

Magnetic spin vortices are stable whirlpool-like objects that can spontaneously form when magnetic materials are rapidly cooled. This project aims to understand and manipulate spin vortices in a magnetic quantum fluid, one of the cleanest and most controllable magnetic systems. The significance is that spin vortices are potentially fundamental elements of future electronic technologies for advanced storage and logic. The expected outcomes are the ability to create spin vortices on demand, and the characterisation of their suitability for future applications.

ARC Future Fellowship - Turbulent Cascades in Superfluid Flatland (2020-2024)

This ARC funded Future Fellowship project will determine how vortex dynamics redistribute energy across broad length scales in superfluids, how turbulence arises from instabilities, and how turbulence redistributes energy in multicomponent superfluids. The results will be beneficial to the understanding of the physics of quantum superfluids, and will inform the engineering of quantum-enhanced devices that utilise trapped superfluid media for precision sensing.

Optimised trapping technology for atomtronic circuits and biological systems (2017)

With our succesful implementation of DMD-based optical trapping, we received a seed funding grant to collaborate with Dr. Jinyang Liang of INRS (Quebec). This goal of this grant was to develop techniques for the optimisation of greyscale DMD potentials.

Making, Probing, and Understanding Two-Dimensional Quantum Turbulence

Marsden Fund (Wellington) grant#UOO1726 (2018-2021), CI Dr Ashton Bradley, PIs Dr Tyler W Neely and Prof. Brian P Anderson (University of Arizona). 

ARC Centre of Excellence for Engineered Quantum Systems (EQUS) (2011–2022)

Abstract: The future of technology lies in controlling the quantum world. The ARC Centre of Excellence for Engineered Quantum Systems (EQuS) will deliver the building blocks of future quantum technologies and, critically, ensure Australian primacy in this endeavour. Three strategic research programs will target Quantum Measurement and Control; Synthetic Quantum Systems and Simulation; and Quantum-Enabled Sensors and Metrology.

ARC Discovery Projects: Riding a quantum wave: transport and flow of atomic quantum fluids (2015–2018)

Abstract: In our lab, we use lasers and magnetic fields to cool tiny samples of millions of atoms to temperatures a few billionths of a degree above absolute zero. At such cold temperatures they form a superfluid known as a Bose-Einstein condensate, that flows with zero viscosity. Using tailored light fields to trap and guide the atoms, we will build rudimentary atomic circuits, and coax the superfluid to flow through a channel between two reservoirs, firstly with thermodynamic gradients, and secondly by building a quantum pump.

Rubinsztein-Dunlop Halina et al, 2017
Journal of Optics, 19, 1, pp. 13001

Structured light refers to the generation and application of custom light fields. As the tools and technology to create and detect structured light have evolved, steadily the applications have begun to emerge.

The development of novel trapping potentials for degenerate quantum gases has been an important factor driving experimental progress in the field. The introduction of spatial light modulators (SLMs) into quantum gas laboratories means that a range of configurable geometries are now possible.

The development of novel trapping potentials for degenerate quantum gases has been an important factor driving experimental progress in the field. The introduction of spatial light modulators (SLMs) into quantum gas laboratories means that a range of configurable geometries are now possible.

Interferometric measurements with matter waves are established techniques for sensitive gravimetry, rotation sensing, and measurement of surface interactions, but compact interferometers will require techniques based on trapped geometries.

McKay Parry Nicholas et al, 2014
Review of Scientific Instruments, 85, 8, pp. 86103

We describe a magnetic coil design utilizing concentrically wound electro-magnetic insulating (EMI) foil (25.4 μm Kapton backing and 127 μm thick layers). The magnetic coils are easily configurable for differentcoil sizes, while providing large surfaces for low-pressure (0.12 bar) water cooling.

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Prof Halina Rubinsztein-Dunlop
Chief Investigator, Professor
Chief Investigator, Research Fellow
Matthew Davis
Chief Investigator, Professor
Tyler Neely
ARC Future Fellow / Senior Lecturer
Guillaume Gauthier
Postdoctoral Research Fellow
Thomas A Bell
PhD Candidate